Update docker.adoc: added hint & link to influxdb deployment

[sjjh]

link to influxdb setup in backend deployment

[codecov[bot]]

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- Coverage      58.87%   26.95%   -31.92%     
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  Lines         113027     7791   -105236     
  Branches        8318     1197     -7121     
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- Hits           66536     2099    -64437     
+ Misses         44000     5597    -38403     
+ Partials        2491       95     -2396     

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[Sn0w3y]

IMHO Every User which sets up OpenEMS should read and is advised to read the Getting Started, where one finds exactly this Information...

OpenEMS is a Powerful Tool and if one needs a Backend (mostly Commercial Users) one would definately know or read the Getting Started i guess. Or at least they should..

[sjjh]

I added it to the Edge part of the getting started -- so the use case here is that you do not need a backend, but still want to save the data persistent in an InfluxDB. Thus the link towards the other part of the getting started guide (to not duplicate the contents).

[github-actions[bot]]

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[sjjh]

@da-Kai probably you can evaluate best if it's worth merging, otherwise feel free to just close it.